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b9a2658a3e
This patch implements the forwarding to frozen C++03 headers as discussed in https://discourse.llvm.org/t/rfc-freezing-c-03-headers-in-libc. In the RFC, we initially proposed selecting the right headers from the Clang driver, however consensus seemed to steer towards handling this in the library itself. This patch implements that direction. At a high level, the changes basically amount to making each public header look like this: ``` // inside <vector> #ifdef _LIBCPP_CXX03_LANG # include <__cxx03/vector> #else // normal <vector> content #endif ``` In most cases, public headers are simple umbrella headers so there isn't much code in the #else branch. In other cases, the #else branch contains the actual implementation of the header.
92 lines
2.3 KiB
C++
92 lines
2.3 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP_CTIME
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#define _LIBCPP_CTIME
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/*
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ctime synopsis
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Macros:
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NULL
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CLOCKS_PER_SEC
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TIME_UTC // C++17
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namespace std
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{
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Types:
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clock_t
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size_t
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time_t
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tm
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timespec // C++17
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clock_t clock();
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double difftime(time_t time1, time_t time0);
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time_t mktime(tm* timeptr);
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time_t time(time_t* timer);
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char* asctime(const tm* timeptr);
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char* ctime(const time_t* timer);
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tm* gmtime(const time_t* timer);
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tm* localtime(const time_t* timer);
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size_t strftime(char* restrict s, size_t maxsize, const char* restrict format,
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const tm* restrict timeptr);
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int timespec_get( struct timespec *ts, int base); // C++17
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} // std
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*/
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#if __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
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# include <__cxx03/ctime>
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#else
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# include <__config>
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# include <__cstddef/size_t.h>
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// <time.h> is not provided by libc++
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# if __has_include(<time.h>)
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# include <time.h>
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# ifdef _LIBCPP_TIME_H
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# error "If libc++ starts defining <time.h>, the __has_include check should move to libc++'s <time.h>"
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# endif
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# endif
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# if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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# endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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using ::clock_t _LIBCPP_USING_IF_EXISTS;
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using ::time_t _LIBCPP_USING_IF_EXISTS;
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using ::tm _LIBCPP_USING_IF_EXISTS;
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# if _LIBCPP_STD_VER >= 17
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using ::timespec _LIBCPP_USING_IF_EXISTS;
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# endif
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using ::clock _LIBCPP_USING_IF_EXISTS;
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using ::difftime _LIBCPP_USING_IF_EXISTS;
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using ::mktime _LIBCPP_USING_IF_EXISTS;
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using ::time _LIBCPP_USING_IF_EXISTS;
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using ::asctime _LIBCPP_USING_IF_EXISTS;
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using ::ctime _LIBCPP_USING_IF_EXISTS;
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using ::gmtime _LIBCPP_USING_IF_EXISTS;
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using ::localtime _LIBCPP_USING_IF_EXISTS;
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using ::strftime _LIBCPP_USING_IF_EXISTS;
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# if _LIBCPP_STD_VER >= 17
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using ::timespec_get _LIBCPP_USING_IF_EXISTS;
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# endif
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_LIBCPP_END_NAMESPACE_STD
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#endif // __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
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#endif // _LIBCPP_CTIME
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